401k Calculator 2026: Estimate Your Retirement Savings, Match & Growth

This page is your primary 401k calculator and 401 k calculator destination: project your account at retirement, compare nominal dollars to inflation-adjusted purchasing power, and visualize growth. For the same math with a lighter layout, open the 401k estimator calculator. Dates and currency follow U.S. conventions (USD, MM/DD/YYYY in copy where cited).

What This 401(k) Calculator Estimates—and What It Does Not

Retirement balance projection (nominal U.S. dollars)

The headline number answers: “If contributions and returns followed my inputs, what might my balance reach at my target retirement age?” It compounds once per year after adding employee deferrals and optional employer contributions—an industry-typical simplification for calculators, not a substitute for your plan’s exact recordkeeping.

Inflation-adjusted “real” balance (purchasing power)

The secondary line deflates the ending balance by your chosen long-run inflation assumption so you can discuss today’s purchasing power, not just large future dollar figures—often more meaningful for retirement anxiety (“Will this be enough?”).

What we do not model here

We do not model loans, hardship withdrawals, Roth vs. traditional tax treatment inside the account, required minimum distributions after age 73, plan fees line-by-line, non-salary compensation, or IRS nondiscrimination tests. For context, see 401(k) loan vs. hardship withdrawal, 401(k) RMD basics, and mega backdoor Roth overview. Use dedicated tools (e.g., early withdrawal, limits) for adjacent questions.

How to Use This Calculator: Steps, Sliders, and Reset

Step 1: Set ages and current balance

Enter your current age, planned retirement age, and today’s account balance. If retirement age is not greater than current age, the tool cannot run a forward projection.

Step 2: Enter salary and employee deferral percentage

Salary drives annual contributions: we multiply salary by your deferral rate (subject in real life to IRS limits—see 401(k) contribution limits 2026).

Step 3: Tune return, salary growth, and inflation

Expected return is not predictable; try conservative and moderate scenarios. Salary growth nudges contributions up over time. Inflation only affects the “real” interpretation, not the nominal curve.

Step 4: Tap Calculate or Reset

Reset demo values restores sample inputs useful for tutorials—not a recommendation of ideal savings rates.

Nominal vs. Inflation-Adjusted Results: How to Read the Output

Nominal ending balance

This is the projected account size in future dollars without deflating for cost-of-living increases. It is useful for comparing scenarios with the same inflation assumption.

Inflation-adjusted ending balance (approximate)

We deflate the ending balance by (1 + inflation)^years to approximate what that sum might “feel like” in today’s spending power. Actual future inflation will differ.

How the chart supports intuition

Visual learners use the curve to see acceleration when compounding works on a growing balance—always an assumption, never a promise.

Input Fields Explained: Salary, Deferral, Return, Employer Field, Inflation

Annual salary before tax

Used to compute dollar contributions from your deferral rate. Bonuses and irregular pay are not separated.

Employee deferral rate

Your elective deferral as a percent of salary. Traditional vs. Roth tax treatment is not simulated here.

Employer contribution (% of salary)

A simplified stand-in for combined employer deposits (match or nonelective). Real match rules are often tiered—use the match calculator.

Expected annual return

A constant rate for education; real portfolios vary year to year.

Inflation

Used only for the purchasing-power estimate, not for adjusting each year’s salary in this model.

401k Growth, Compounding, and Time Horizon

Why “401k growth calculator” searches land here

People want to see how 401k compound interest (more precisely, compounded returns) interacts with recurring contributions. Longer horizons and higher savings rates generally increase ending wealth in a model—not a guarantee in real markets.

Relationship to 401k projection and future value

This tool is a 401k projection calculator / 401k future value calculator style engine: future value of today’s balance plus a stream of contributions under flat assumptions.

Employer Match: Simple Field on This Page vs. Tiered Match Tool

The home calculator keeps one optional employer field for speed. If your Summary Plan Description lists multiple tiers, switch to 401k calculator with match to approximate annual match dollars and effective match rate as a percent of salary.

Paycheck impact when raising deferrals

Raising deferrals changes take-home pay. Model a rough per-paycheck effect with the 401k paycheck impact calculator.

Related Calculators & Guides (Card Shortcuts)

Tap a card for a dedicated tool or guide. For the full list of every URL (including all blog posts), use Explore This Site at the top of this article.

401(k) Knowledge Base & Blog (Guides Beyond the Numbers)

Calculators answer “how much” and “what if.” Our blog & knowledge articles also cover Rule of 55, 72(t) SEPP, SECURE Act topics, inherited 401(k), QDROs, vesting, safe harbor / ADP testing, in-service rollovers, part-time eligibility, student-loan match, SEP/SIMPLE vs. 401(k), target-date funds, fees, NUA, auto enrollment, blackouts, plus rollovers to IRAs, 401(k) loans vs. hardship, catch-up after 50, IRA vs. 401(k), RMD basics, mega backdoor Roth, Roth vs. traditional, match strategy, benchmarks by age, 403(b)/457 vocabulary, early withdrawal, and solo 401(k)—written for U.S. readers, with IRS links and YMYL disclaimers. Below are all current articles (same links appear in Explore This Site above).

Browse all articles

Search Variations: 401 k Calculator, 401l Calculator, 401k Estimator Calculator

401 k calculator (with a space)

Search engines treat many spacing variants similarly. This page satisfies 401 k calculator intent with the same tool and headings.

401l calculator (typo)

Some users search for 401l calculator when they mean 401k calculator—often a keyboard slip. You are on a U.S. 401(k) plan calculator. For IRA vs. 401(k) and rollovers, see our IRA vs. 401(k) comparison and 401(k) rollover to IRA guides.

401k estimator calculator

Users typing 401k estimator calculator usually want a quick end balance; we provide both this full page and the dedicated estimator page to reduce keyword overlap while keeping internal links strong.

IRS Limits, Compliance, and YMYL Authority

Retirement topics are YMYL (Your Money Your Life). We cite primary sources: IRS retirement plans for limits and rules; OPM is relevant for federal employees’ benefits—distinct from private-sector 401(k) plans but sometimes confused in search. Always read your plan document and SPD.

Frequently Asked Questions

Is this personalized financial advice?

No. This is general education. Your plan rules, tax situation, and goals are unique.

Does the chart guarantee future performance?

No. Returns are user-selected assumptions. Actual results will differ; you can lose money.

Can I rely on this for IRS contribution limits?

Use our limits overview as orientation only; confirm dollar amounts on IRS.gov for the applicable tax year.

Where can I model cashing out early?

See 401k early withdrawal calculator for a simplified penalty and withholding illustration.